Crankshaft grinding machine



July 15, 1947. J. MlEssE y CRANKSHAFT GRINIDING MACHINE l Filed Sept. 5,1946 3 Sheets-Sheet 5 Sheets-Sheet 2 J. MIESSE CRANKSHAFT GRINDINGMACHINE July 15, 1947.

' Filed Sept. 5, 1946 a ,NN

July 15, -1947. J. MlEssE CRANKSHAFT GRINDING MACHINE 3 *Sheets-Sheet 5Filed sept'. 5, 1946 v Il I I l l l l l I i l Patented July`15,`1947UNITED STATES PATENT OFF-.ICE

- Application September 5, 1946;Seria1ANo. 694,883 In Belgium'September` 29, 1945 This invention relates to crankshaft grinding ortruing machines andihas for'its particular objectto design a machine ofthis 'type' that would be of compact and inexpensive construction andSuch as would "enable grinding operations to be effected in a Ashortertime.

According -to the invention, V,the crankshaft grinding' machine is' sodesigned as to enable' Athe crankshaft to be ground in a verticalposition and comprises a standard'having slidably mounted thereon acarriage balanced by a counterweight the said carriage carrying atransverse shaft having slidably mounted thereon and suspended foroscillatory movement lthereon the' grinding wheel carrier mechanism; aresilient locking device being provided for keeping the'said grindingwheel carrier mechanism in its 'operative' position and for enablingdisengagement and 'reeengagement thereof from and Yinto said' positionvwithout disturbing the micrometer feed adjustment of the grinding wheelcarrier mechanism. i

According to a further feature of the invention, the vertical movementYof` the 'carriagev may be effected through an optional vgeared downmechanism and a quick action' mechanism. v

One way of carrying the invention into effect will be hereinafterdescribed with reference to the accompanying drawin'gsin which:

Fig. 1 is a 'frontelevati'on of the 'crankshaft' grinding machine; p A

Fig. 2is a sectional'view alongthe broken line II-II'of'Fig". 1'; l

Fig. 3 is a front View, drawnto a-larger'scale of the carriage formingapart 'of the machine and having mounted thereon 'thelgrindingmechani'sm;

Fig. 4 is afragmentarysectional view taken at an angle of 45? withrespectto Fig. 3;

5 is adet'ail' view showing' some of the constitutive parts of thegrinding mechanism.

Fig. 6 is aside 'view' of"Fig. 3; and,

Fig. '7 is aplan view of vFig'. 3.

' In the drawings', the'table I of a base 2 (Figs. 1 and 2)' has pivotedthereto a horizontal circular plate 3 formed 'with a 'peripherical'.groove 4` for engagement of a V-belt 5`d1'iven' 4fromlthe iiywheel 6 ofa motor 1. VTh'elatter is pivotally supported on a pin 8, the said motorbeing 'adapted to be locked on the said pin, in 'various angularpositions by lmeans of a'bolt 9, thus providing for the adjustment ofthe tension of the belt'5.

The table I has formedtherewith 'or otherwise secured thereto a'standard 'IIJ comprising. a" slide l I having'slidablymounted'thereon acarriage I 2 balancedb'y acouterweight I'3 through the me-y 2 diu'm of achain I4 adapted to run over pulleys 15. A second plate I6 guided in a'diametrically ex-` tending groove I1 ofthe 'plate`3 is atilaptedA to belocked in an eccentric position with respect to the plate 3. Thej'plateI6 supports a rotarychu'ck plate i6' provided with locking means andadapted. to receive `the fiange. of a crankshaft' IBQtQ bei ground', ythe latter being secured vto the rotary chuck'plate I6" by bolts passingthrough holes IAQ in the latter plate. "The arrangement 'is such thatwhen the. crankshaft has been centred 'on the .rotarychuck-plate IGj-thelatter isin turn being'ilckd ,to the plate 16. K V'Slidably mounted`on'. th'esli'dev Il. (is ahead stock k20' adapted 'to b .locked asuitable position on vthe standar-d10 and carrying acenti' 2| adapted.to engage the axial. bore Vof -the `crankshaft whereby to holdthe latterin position.

In a socketi22 Aarranged laterally o f the base k2 there is securedavertical-column 1,23 havinglits upper end! supported by anYarmzlextcndin'g from thet'op endportion 'of the standard '|0. (Thecolumn 23k has slidably mounted thereon. a sleeve 25 provided with alocking handle" 26,.the said sleeve carrying a fork' ZIadaptedto-sustain'the work 'to be ground.

Slidable with. easy". friction onatransversely positioned tub'28.f(1igs.1, 3, l4), vhiclihast's ends secured to thecarriage '.'|.2, thereisarranged aislee've 29'rigid with a bracket 30, thelatter. having securedthereto the motor 3| adapted,

through the medium of pulley '32 and be1t.'33,fto drive a 'shaft' theouter end ofwhichcarries the grinding 'wheel '34, the rsaid shaft beingrotatably mounted in a bearing 3 5 rigid with thebracketflt The grindingmechanism 2.9;13!) 3l constructed asshown. formsl a'pendulous assemblyadaptedto oscillate around the tube 28. y

When Vgrindingis being effected, the grinding wheelA 34,` while beingcaused to .rotate `at high speedA underthe drive .of the vmotor -3 l mayperform in addition an angulardisplacement `around the axis of the tube'28, which;isobtained v`bythe operator actuating. a'handlef. .Owinggtosuch angular'displacement'the .grinding Wheelmay be completely'disengaged' from' the portion of 1 the work which-r` is underfgrindingand, moreovergfthe grindingvoperation may befstarted by progressiveliTyengaging'the periphery of the grinding wheel with a resulting highlysmooth working contact.

The Amotor 3`I is connected through a flexible cable 31 to a switchboard(not shown) secured totheinachine; the said switchboard controlling 3 inaddition the motor I adapted to impart rotary movement to the plate 3.

The feeding mechanism whereby the position of the grinding wheel isadjusted with respect to the axis of the stock to be ground comprises ashaft 54 slidably mounted in the bracket 3Q and adapted to cooperatewith an abutment plate 55 rigid with the carriage I2, The shaft 54 isscrew threaded and hasV formed therein a longitudinal groove 55having'engaged therein a guidekey 5lV rigid with the bracket 30.

In a recess 5B in the bracket 35 there is pro.:

vided a tapped sleeve 59, said sleeve engaging the,

1 `bears against the abutment plate 55.

shaft 54 and having its ends abutted againstthe'Y walls of the recess58.

The said sleeve has, Y mounted thereon a pinion G adapted to cooperate uwith a worm formed on a shaft Eil;journalledA transversely in thebracket and operated by means of a knob 52 provided with a movable dialfurnished with resilient arresting means, the said dial co-operatingwith a fixed graduated scale providedlon the mechanism.

A spring 63having one of its ends attached to a ring 64 fixed to thecarriage 'IZ (see more particularly Fig.v5) has its oppositeend engagedby a bar ,65 terminating in a pawl 65; The said pawl is adapted toengage one of a series of corresponding teeth offa rack S'I fixed to alaterally protruding portion of the bracket 36 (Fig. 6), the functionofv the spring and rack assembly being to press the shaft 54resilientlyA against the abutment plate 55 on the carriage. VAt the rearof the pawl 55, the bar 55 is provided with a clevis 68, the clevis pinAGil being adapted to cooperate with a hook 'I0 formed on the end of acontrol lever "Il, pivotally mounted at 'I2 onto the carriagejlz. R 11'When the lever 'II is shifted from' left to right, the 'hook I0 isbrought into engagement with the clevispin 69 and retraots the pawl'outof engagement with the teeth of the rack 36'?. Stops 'I3 are adaptedtoV limit the stroke of the Vlever 'EI in'either direction ofmoi/ement.A `On the other hand, when the 'saidlever is shifted fromright togleft-whi'ch is effective in the pawl '56 engaging one `of theteeth of the rack 6l, in accordance with the diameter of the stock to beground--V the rack teeth, so 'thatthe pawl' Vwill `be held correctly bythe teeth. 'p

Thescrews 74 bywhich the abutment plate 55 is fixed in place areprovided with conical heads which act as stops adapted to`v limit themagnitude of pendulous movement imparted to vthe grinding `mechanismbythe actionof the operator when the latter actuates the handle V3S forthis purpose. Y rIfhe above described vfeed mechanism Yfor the grindingwheel makes it possibleY to' eiect the adjustment Vof the position ofthe'grinding wheel 34v with respect to the axis of the stockV to beground, withaccuracy. The aforesaid mechanism further enables the saidgrinding wheel to be quickly retracted from its operative position,which result is vachieved through the Aactuation of the lever 1I, which,by disengaging the pawl 56 from the rackr'his effectivey in shutting outthe action of'the resilient locking device for lthe grinding mechanism,so that the sleeveV 2,9V by which theV latter is suspended on theycarriage is applies a manual' pull on the knob d8.V f

When the grinding` mechanism is infthe' re# able to slide onA the shaft28 when the operator ,Vertical displacement of the carriage I2 along theguides II in the course of the grinding operationj -is' normallyeffected by actuating the crank 4S which operates a shaft l5 carrying afwormgj `engaginga pinion 55 integral with a Y pinion-52 (Fig. 7), thelatter pinion co-operating with a' rack 53 fixed to the standard Il).The pinion 50 and the pinion 52 are keyed onto a shaft 5| journalled inthe carriage I2 and adapted to be operated by a crank Ti. The shaft 15,which is operable by the crank 49, is rotatably mounted in a housing 'I3adapted to be rocked around a fulcrum pin 'I9 supported on the carriageI2. A rod til pivotedto they housing 1B and subjected to the action of aspring y8l tends to keep the worm 'i5 in constant mesh with the Dinion5i).

Owing the lparticular arrangement of theoperating gear for effectingythe vertical displacements of the carriage, as above specified, a fineadjustment' of the feed of the said carriage may be obtained in thecourse of the grinding operation, which israchieved in operating thehandle 49,while,` on'the'other hand, the said carriage may be fed at agreater speed when it is required `to vchange over from 'one crank pin"to another or 'from' one bearing surface to another.

In order to perform the high speed movement of the carriage, Atheoperator willgrip withv his right hand the crank 59, pulling 'the latterdownwards against the opposing action' of 'the' spring 8l, whichmovement causes the housing 'i8 to be rocked around the fulcrum pin 19,'thus disengaging the worm I5 from lthe pinion 58. Once the worm `il hasbeen disengaged from thel pinion '50, ythe operatoriwill actuat'ewithhis' left hand vthe crank il which will 'operate the pinion 52 andwill cause the displacement ofthe ca'rf riage in the desired directionuntil .the new operative position is reached. The operator will thenrelease the crank 49, thus allowing the'worm 'I6 to return automaticallyinto'mesh with the pinion 50 under the action of the spring 8 I.

Owingv to the vertical arrangement ofY the crankshaft inthe deviceaccording Vto the in- Vention, the'counterweights vrequired forbalancing the crankshaftin a horizontally workingdevice aredispensedwith, thus allowing for a substantial saving in labour as far as theoperation of placing thework iin the `grinding machine is concerned. YDue to the' elimination of counterweightsthe rotation of thecrankshaftlis` ren-v dered more uniform and the work performed 'is moresatisfactory. 'Y j Moreover, the position of stable equilibrium assumedby the crankshaft with the "crankshaft ilange acting asa base when theWork is in po sition onthe Vchuck plate of thergrinding machinelrn'ak'es`the, centering operation4 easier and more expeditious.

Furthermore, the centringof the`*crankshaft greatly `facilitated-andre'ndered' lmore. expeditious by'theprovision'of 'thepl'ate llwhich isadapted to slidewith respect to the plate '3.

.In 'acrankshaftfgrinding machine, a base, ahorizontal rotatable -plateon the said base, means on-fthe' said plate for centering and fixing the"crankshaft tothe lground in the Vertical position, ane'lectric motorsupported by thesaid base, a V-belt transmission for connecting'theAsaid motor'tothe said-plate, a standard secured onto the said base,vertical slides associated with the said standard, a head stock forbeing xed in an adjustable position o-n the said slides and forsupporting the end of the stock to be ground, a sliding carriage on thesaid slides, a counterweight for balancing the said carriage, a linkingmember for connecting the said carriage to the said counterweight, meansassociated with the said carriage for operating the vertical movementsof the latter along the said slides, a grinding device suspended forrocking motion on the said carriage, and means for moving the grindingdevice radially with respect to the axis of the stock to be ground.

2. In a crankshaft grinding machine, a base, a horizontal drive plate onthe said base for centering, for securing and for driving the crankshaftin its vertical position, a standard secured onto the said base, slideson the said standard, a counterweighted carriage for sliding along theslides, means for operating the vertical displacements of the saidcarriage along the said slides, horizontal cylindrical guiding meansassociated with the said carriage and located radially with respeci; tothe axis of the stock to be ground, a grinding device, a sleeveassociated with the top portion of the grinding device for slidingmovement on the said guiding means and for enabling the said grindingdevice to rock around the said guiding means, a grinding Wheel shaftjournalled in the said grinding device, an electric motor securedbeneath the said grinding device, a belt transmission for connecting thesaid motor to the said grinding wheel shaft, means for adjusting theradial distance between the grinding device and the axis of the stock tobe ground, resilient means for maintaining the said grinding device inits operative position, means for rendering the said resilient meansinoperative, and means for said .grinding 'device and the said carriagefor keepinglthe said screw threaded shaft in contact with the saidixedfabutment provided on the carriage, and means for rendering the saidresilient connection inoperative and for causing the saidk grindingdevice to slide on the said horizontal guiding device.

4. In a crankshaft grinding machine, a base, a horizontal driveA plateon the said base for centering,.iorisecuring and 'for-driving thecrankshaft in its vertical ,position-aV standard secured 'onto the saidbase, slides on the said standard, a counterweighted carriage slidingalong the said slides, means for operating the vertical displacements ofthe said carriage along the said slides, horizontal cylindrical guidingmeans associated With the said carriage and located radially withrespect to the axis of the stock to be ground, a grinding devicesuspended for rocking and for sliding movement on the said guidingmeans, a fixed abutment secured tothe said carriage, an adjustableabutment provided on the said grinding device for cooperation with thesaid fixed abutment, a tension spring having one of its ends hooked tothe said carriage, a pawl carrying member hooked to the other end of thesaid spring, a rack integral imparting manually a limited rockingmovement to the said grinding device.

3. In a crankshaft grindingI machine, a base, a horizontal drive plateon the said base for centering, for securing and for driving thecrankshaft in its vertical position, a standard secured onto the saidbase, slides on the said standard, a counterweighted carriage forsliding along the said slides, means for operating the verticaldisplacements of the said carriage along the said slides, horizontalcylindrical guiding means associated with the said carriage and locatedradially with respect to the axis of the stock to be ground, a grindingdevice suspended for rocking and for sliding movement on the saidguiding means, a fixed abutment secured to the said carriage, a screwthreaded shaft slidably mounted in the said grinding device forco-operation with the said fixed abutment, a tapped sleeve engaged uponthe said screw threaded shaft and having both of its ends abutted in thesaid grinding device, a pinion secured around the said tapped sleeve, aworm journalled in the said grinding device for driving the said pinion,a knurled knob for operating the said Worm, a resilient connectionbetween the with the suspended grinding device the said rack having oneof its teeth normally engaged by the pawl on the said member, a clevisformed at the back of the pawl on the said member, a pin in the saidclevis, an operating lever pivoted in the said carriage, a hook on oneend of the said lever for engaging the said clevis pin and disengagingthe said pawl from the said rack When the said operating lever is movedangularly in one direction and for re-engaging the said pawl of the saidmember in the said rack when the said operating lever is moved in theother direction for disengaging the said lever from the said clevis pin.

5. In a crankshaft grinding machine, a base, a horizontal drive plate onthe said base for fixing and driving the vertically positionedcrankshaft, a standard secured to the said base, slides associated withsaid standard, a counterweighted carriage for sliding along the saidslides, a horizontal cylindrical guide associated with the said carriageand arranged radially with respect to the axis of the stock to beground, a grinding device suspended for rocking With respect to and forsliding along the said guide, means for adjusting the radial distancebetween the said grinding device and the axis of the stock to be ground,resilient means for maintaining the said grinding device in theoperative position, means for rendering the said resilient meansinoperative and for causing the said grinding device to slide along thesaid guide, a rack provided along the slides of the said standard, ashaft supported in the said carriage, a pinion secured onto the saidshaft for co-operating with the teeth of the said rack, an operatingcrank associated With the said shaft, a second pinion secured onto thesaid shaft, a rocking housing pivoted to the said carriage, a shaftjournalled in the said housing, a crank handle for operating the saidsecond shaft, a Worm integral with the said second shaft for cooperatingWith the said second pinion, and a spring for acting on the said housingfor maintaining the said worm in engagement with the said second pinion.

6. In a crankshaft grinding machine, a base, a horizontal rotatableplate on the said base, a diametrally extending groove in the saidplate, a support associated with the said plate for sliding ground, acarriage slidable on the said slides, a counterweight for balancing thesaid carriage, linking means for connecting the said carriage to thesaid counterweight, means associated with the said carriage foroperating the vertical displacements thereof along the said slides, agrinding device mounted for rocking motion on the said carriage andmeans for shifting thesaid grinding device radially with respect to theaxis of the work 10 to be ground.

JULES MIESSE.

